Mixing injection molding device, injection molding machine and method

Abstract

The invention relates to the technical field of plastic processing, and provides a mixing injection molding device, an injection molding machine and a method, the mixing injection molding device comprises a single-screw extrusion system, the single-screw extrusion system comprises a single-screw extrusion device and a first feeding port formed in one end of the single-screw extrusion device, and a first discharging port is formed in the other end of the single-screw extrusion device; the injection molding machine injection system comprises a single-screw injection device and a second feeding port formed in the single-screw injection device, and the first discharging port is connected with the second feeding port; wherein the second feeding port is located at the upstream position of the single-screw injection device in the material flowing direction, and the single-screw extrusion system and the injection molding machine injection system can work in a linkage mode or the injection molding machine injection system can work independently. Mixing is completed through the single-screw extrusion system, equipment is easy to operate and maintain, the single-screw extrusion system and the injection molding machine injection system can be compatible with an injection molding mode at the same time, the injection molding function of the injection molding machine is directly achieved, and when the single-screw extrusion device stops, the single-screw injection device can still serve as the injection molding machine to work independently.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, and in particular to a mixing and injection molding device, an injection molding machine and a method. Background Art

[0002] With the vigorous development of new energy vehicles and emerging transportation fields, the requirements for functionality, lightweight and sustainability of automotive parts are increasing. The parts produced by traditional injection molding technology have gradually shown limitations in performance and material utilization efficiency. Especially in the context of pursuing higher strength, lower weight and better environmental adaptability, conventional injection molding technology is difficult to meet the market demand for high-performance materials. Among them, the twin-screw extrusion system, as an advanced form of injection molding technology, has significantly improved the flexibility and freedom of formula design by deeply integrating material technology with injection molding technology, so that the performance potential of high-performance materials such as fiber-reinforced plastics can be fully explored and demonstrated.

[0003] The core advantage of the twin-screw extrusion system lies in its excellent mixing and plasticizing capabilities. It can efficiently process complex mixtures including various resin matrices, fiber-reinforced materials and a variety of additives, and achieve highly uniform material dispersion and precise temperature control management. However, this technology is not without challenges. The integration of twin-screw compounding technology and injection molding technology spans two completely different technical fields, with high technical barriers, especially in the precision design of screw elements and the operation and maintenance of the overall equipment, which requires technicians with profound professional knowledge, which places strict demands on the skill level of end users. In addition, the integration of the two sets of technologies has resulted in complex equipment parameters and numerous setting details, which not only increases the difficulty of operation, but also limits the popularity and application scope of the technology.

[0004] More specifically, the injection part of the twin-screw compounding system adopts piston injection. This feature requires that the twin-screw system must be fine-tuned before each startup to ensure the stability of the production process and the consistency of product quality. This undoubtedly increases production preparation time and cost, and is not conducive to rapid response to market demand.

[0005] Faced with these challenges, the industry urgently needs a new generation of material compounding and injection molding technology that can not only maintain the high efficiency and performance of twin-screw extrusion compounding and injection molding technology, but also simplify the operating process, lower the technical threshold, and enhance compatibility with conventional injection molding processes. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a mixing and injection molding device, an injection molding machine and a method, wherein the extruder is designed as a single-screw extruder, which is directly connected to the injection molding device, thereby reducing the use of a melt buffer device, and the injection molding machine injection system can be connected to the single-screw extrusion system for direct mixing and injection molding, and can also be operated independently to form a standard injection molding machine, thereby reducing the manufacturing cost and the difficulty of operation.

[0007] A mixing and injection molding device according to an embodiment of the present invention includes: A single screw extrusion system, comprising a single screw extruder, wherein one end of the single screw extruder is provided with a first feeding port, and the other end of the single screw extruder is provided with a first discharge port; and An injection molding machine injection system, the injection molding machine injection system comprising a single-screw injection device and a second feeding port opened on the single-screw injection device, the first discharge port being connected to the second feeding port; The second feed port is located upstream of the single screw injection device in the material flow direction, and the single screw extrusion system and the injection molding machine injection system can operate in conjunction or the injection molding machine injection system can operate alone.

[0008] According to the mixing and injection molding device of the embodiment of the present invention, the injection system of the injection molding machine is arranged horizontally, and the single-screw extrusion system is installed at a preset angle to the injection system of the injection molding machine.

[0009] According to the mixing and injection molding device of the embodiment of the present invention, the preset angle is 30 degrees to 60 degrees.

[0010] According to the mixing and injection molding device of the embodiment of the present invention, the single-screw extrusion system is located directly above the injection system of the injection molding machine, and the single-screw extrusion device and the single-screw injection device are mechanically connected.

[0011] According to the mixing and injection molding device of the embodiment of the present invention, a first single screw is provided inside the single-screw extruder; a second single screw is provided inside the single-screw injection device, and the first single screw and the second single screw are connected via telecommunication. When the first single screw rotates, the start and stop of the injection molding cycle with the second single screw can be controlled by software.

[0012] According to the mixing and injection molding device of the embodiment of the present invention, the aspect ratio of the single screw is 25-35.

[0013] According to the mixing injection molding device of the embodiment of the present invention, the injection molding machine injection system also includes a third feeding port, which is located upstream of the second feeding port in the material flow direction and is used to directly feed the single-screw injection device.

[0014] According to the mixing and injection molding device of the embodiment of the present invention, the injection molding machine injection system further includes a nozzle; The nozzle is of a locking type and is installed at the end position of the material flow direction of the single-screw injection device.

[0015] The mixing and injection molding device according to the embodiment of the present invention further includes an early warning system; The early warning system includes a pressure sensor arranged at the connection position between the single-screw extrusion system and the injection system of the injection molding machine, which is used to detect the material pressure inside the single-screw extrusion device and issue a pressure early warning.

[0016] An injection molding machine according to an embodiment of the present invention comprises any one of the mixing and injection molding devices described above.

[0017] An injection molding machine according to an embodiment of the present invention includes: an injection molding machine housing; The injection system of the injection molding machine is fixedly installed inside the shell of the injection molding machine.

[0018] A mixing injection molding method according to an embodiment of the present invention includes: Mixing stage: the hopper of the weight loss metering system adds the plastic resin material into the single screw extruder through the first feeding port according to the preset ratio and mixes it to obtain a mixed material; Plasticizing stage: the mixed material is transported from the first discharge port of the single screw extrusion system to the second single screw of the single screw injection device through a channel to obtain injection molding material; Wherein, a pressure sensor is provided in the channel; Injection stage: The injection material is injected through the nozzle into the working device of the next stage.

[0019] According to the mixing and injection molding method of the embodiment of the present invention, the mixing stage further comprises: The first single screw continuously rotates to convey the mixed material to the second single screw.

[0020] According to the mixing and injection molding method of the embodiment of the present invention, the injection stage further comprises: When the second single screw is plasticized to a preset metering amount, the second single screw, the first single screw and the weight loss metering system stop working at the same time.

[0021] According to the mixing and injection molding method of the embodiment of the present invention, during the injection stage, the single-screw extruder can be turned off and the single-screw injection device can be directly used for injection molding.

[0022] According to the mixing and injection molding method of the embodiment of the present invention, the maximum pressure borne by the pressure sensor in the plasticizing stage is 200 bar.

[0023] According to the mixing and injection molding method of the embodiment of the present invention, the nozzle is opened during the injection stage, and the second single screw performs pressure holding.

[0024] According to the compounding and injection molding method of the embodiment of the present invention, the single-screw extruder is used to process thermoplastic resin materials and corresponding formulations.

[0025] According to the compounding injection molding method of the embodiment of the present invention, the plastic resin material includes but is not limited to polyolefin material, acrylonitrile-butadiene-styrene plastic, engineering plastic alloy, polycarbonate plastic, polyamide plastic, EPDM rubber material or polylactic acid material.

[0026] According to the compounding and injection molding method of the embodiment of the present invention, auxiliary agents can be added to the plastic resin material.

[0027] According to the compounding injection molding method of the embodiment of the present invention, the auxiliary agent includes but is not limited to filler mineral powder, heat stabilizer, ultraviolet absorber, impact modifier or conductive filler.

[0028] According to the compounding and injection molding method of the embodiment of the present invention, the single-screw extruder is used to process fibers including but not limited to glass fibers, carbon fibers, aramid fibers or basalt fibers.

[0029] According to the mixing and injection molding method of the embodiment of the present invention, the rotational speed percentage of the second single screw and the first single screw is 20%-73%.

[0030] The above one or more technical solutions in the embodiment of the injection system of the present invention have at least one of the following technical effects: The embodiment of the present invention provides a mixing injection molding device, an injection molding machine and a method, including: a single screw extrusion system, including a single screw extrusion device and a first feeding port opened at one end of the single screw extruder, and a first discharge port opened at the other end; and an injection molding machine injection system, the injection molding machine injection system includes a single screw injection device and a second feeding port opened on the single screw injection device, and the first discharge port is connected to the second feeding port; wherein the second feeding port is located at the upstream position of the single screw injection device in the material flow direction, and the single screw extrusion system and the injection molding machine injection system can work in conjunction or the injection molding machine injection system can work alone. By using the single screw extrusion system to complete the mixing of materials, the process is more streamlined, the equipment is easy to operate and maintain, the single screw extrusion system and the injection molding machine are connected and can also be compatible with the injection molding mode at the same time, the injection molding screw can also run alone to form a standard injection molding machine, directly realizing the injection molding function of the injection molding machine, when the single screw extrusion device stops, the injection molding machine injection device can still work alone as an injection molding machine.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic structural diagram of a mixing and injection molding device provided in an embodiment of the present invention; Figure 2 yes Figure 1 sectional view of Figure 3 is a structural schematic diagram of an injection molding machine provided by an embodiment of the present invention; Figure 4 An embodiment of the present invention provides a composite propeller component as a molded product.

[0034] Reference numerals: 1. Single screw extrusion system; 11. Single screw extrusion device; 12. First feeding port; 13. First discharge port; 14. First single screw; 2. Injection molding machine injection system; 21. Single screw injection device; 22. Nozzle; 23. Second feeding port; 24. Third feeding port; 25. Second single screw; 3. Pressure sensor; 4. Injection molding machine housing. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0038] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0040] The present invention provides a mixing injection molding device, an injection molding machine and a method, which are mainly used in the field of material processing. The equipment is easy to operate and maintain; a specially designed single screw is sufficient to meet the mixing of material additives and fibers. By combining a single-screw mixing method with a standard injection molding screw, the freedom of material formula design is met and it can be compatible with standard injection molding equipment. The single-screw extruder and the single-screw injection device are connected by telecommunications. When the single-screw extruder rotates, it can be started and stopped simultaneously with the single-screw injection device during the injection molding cycle through software control. It is more power-saving than a twin-screw extruder that does not stop, and it saves energy at the same time, meeting its perfect combination of specific scenarios and versatility, and also eliminating complex structures such as melt buffers. The mechanical structure of the single-screw extrusion system and the injection system of the injection molding equipment has been redesigned compared to the classic twin-screw mixing injection molding equipment, making it streamlined and easy to operate; the overall solution is more efficient.

[0041] An embodiment of one aspect of the present invention, in combination with Figure 1 As shown, an embodiment of the present invention provides a mixing injection molding device, including a single screw extrusion system 1, including a single screw extrusion device 11 and a first feeding port 12 opened at one end of the single screw extruder, and the other end of the single screw extrusion device 11 is provided with a first discharge port 13; and an injection molding machine injection system 2, the injection molding machine injection system 2 includes a single screw injection device 21 and a second feeding port 23 opened on the single screw injection device 21, the first discharge port 13 is connected to the second feeding port 23; wherein the second feeding port 23 is connected to the second discharge port 1 ... The port 23 is located at the upstream position of the single screw injection device 21 in the material flow direction, and the single screw extrusion system 1 and the injection molding machine injection system 2 can work in conjunction or the injection molding machine injection system 2 can work alone, making the process more streamlined and the equipment easy to operate and maintain. The single screw extrusion system 1 and the injection molding machine injection system 2 are connected and can also be compatible with the injection molding mode at the same time, and can directly realize the injection molding function of the injection molding machine. The injection molding machine injection system 2 can start and stop with the single screw extrusion system 1 according to the injection molding cycle through software control. The single screw extrusion system 1 and the injection molding machine injection system 2 are connected to ensure joint work, and can be switched to the conventional injection molding mode at the same time, so that the direct mixing technology and conventional injection molding can be flexibly switched and compatible with each other, which increases the use scenarios of the equipment and reduces the startup loss and production costs.

[0042] In this embodiment, the injection molding machine injection system 2 is arranged horizontally, the single screw extrusion system 1 is installed at a preset angle with the injection molding machine injection system 2, the preset angle is 30 degrees to 60 degrees, the single screw extrusion system 1 is located directly above the injection molding machine injection system 2, and the single screw extrusion device 11 is mechanically connected to the single screw injection device 21. If an external work frame is installed, the single screw extrusion system 1 can save working space and can also avoid the single screw extrusion system 1 being too high or excessively affecting the processing effect.

[0043] Furthermore, a first single screw 14 is provided inside the single-screw extruder 11; a second single screw 25 is provided inside the single-screw injection device 21, the first single screw 14 and the second single screw 25 are connected via telecommunication, and when the first single screw 14 rotates, the first single screw 14 and the second single screw 25 can be started and stopped during the injection cycle through software control, and the first single screw 14 and the second single screw 25 are controlled by input from the equipment controller, and can be stopped when processing is not required, thereby saving the operating cost of the device.

[0044] Among them, the screw aspect ratio of the first single screw 14 is 25-35, the second single screw 25 is a standard injection molding screw or a special functional screw, and the rotational speed percentage of the second single screw 25 and the first single screw 14 is 20%-73%. By setting the aspect ratio of the first single screw 14, it is ensured that the first single screw 14 can fully mix and melt different components. The second single screw 25 can use any screw in the injection molding plasticizing work and can operate normally, and the versatility is extremely high. The rotational speeds of the first single screw 14 and the second single screw 25 can ensure that they are suitable for processing any plastic material in the current plastic processing field.

[0045] The injection molding machine injection system 2 also includes a nozzle 22 and a third feed port 24. The nozzle 22 is a locking type and is installed at the end position of the material flow direction of the single screw injection device 21. The third feed port 24 is located at one end of the single screw injection device 21 away from the nozzle 22, and is used to directly feed the single screw injection device 21. The locking nozzle 22 is opened during the injection pressure holding stage and closed during the material storage stage. The second single screw 25 can directly hold the pressure of the entire product, eliminating the need for multiple valves, making the operation simpler. When the injection molding machine injection system 2 works alone, it can directly discharge the material through the third feed port 24, which is easy to operate and does not require other equipment for transition.

[0046] In this embodiment, an early warning system is also included, which includes a pressure sensor 3 arranged at the connection position between the single-screw extrusion system 1 and the injection molding machine injection system 2, which is used to detect the internal material pressure of the single-screw extruder 11 and make a pressure warning. The pressure sensor 3 can set the pressure value to be tolerated according to processing needs and promptly alarm when the pressure value is exceeded.

[0047] It is understandable that since the mixing and injection molding device can blend plastic resin components, it can include PP (polypropylene material), PE (polyethylene material), ABS (acrylonitrile-butadiene-styrene plastic), PC / ABS (engineering plastic alloy), PC (polycarbonate plastic), PA (polyamide plastic), EPDM (ethylene propylene diene monomer rubber material), PLA (polylactic acid material), etc., among which PP and PE constitute polyolefin materials; additives can be added, including filler mineral powder, heat stabilizer, UV absorber, impact modifier, conductive filler, etc.; at the same time, the components that can be enhanced include glass fiber, carbon fiber, aramid fiber, etc. The special design can complete the blending modification and melt plasticization between different formula components, and can achieve the processing of different varieties, making the mixing and injection molding device more widely applicable.

[0048] Furthermore, the single-screw extruder 11 is directly connected to the single-screw injection device 21, eliminating the melt buffer in the middle of the classic twin-screw system as a buffer part, making the entire structure simpler and easier to operate, saving floor space, and facilitating maintenance by staff. Reducing the melt buffer is more conducive to maintaining better performance of the material melt under limited residence time, thereby ensuring the stability of the material during the plasticization process.

[0049] In this embodiment, direct mixing reduces the complexity of the equipment structure, reduces the difficulty of operation and maintenance, and broadens the scope of application of the equipment while ensuring the blending, melting and plasticization of materials with different formulas.

[0050] According to one embodiment of the present invention, Figure 3 As shown, an embodiment of the invention provides an injection molding machine, including an injection molding machine housing 4, the injection molding machine housing 4 is an open rectangular shell structure, and the injection molding machine injection system 2 is fixedly installed inside the injection molding machine housing 4 along the long end direction of the injection molding machine housing 4.

[0051] In another embodiment, a mixing injection molding method is provided, comprising: Mixing stage: the hopper of the weight loss metering system adds the plastic resin material and the corresponding formula components into the single screw extruder system 1 through the first feeding port 12 according to the preset ratio for mixing to obtain a mixed material; Plasticizing stage: the mixed material is transported from the first discharge port 13 of the single screw extruder system 1 to the second single screw 25 of the injection molding machine injection system 2 through a channel to obtain injection molding material; Wherein, a pressure sensor 3 is provided in the channel; Injection stage: The injection molding material is injected through the nozzle 22 to the working device of the next stage.

[0052] In this embodiment, during the injection molding stage, the single-screw extruder system 1 rotates, and the material to be processed is fed from the first feeding port 12. Each component of the material to be processed is added to the weight loss metering system in sufficient quantity according to the production demand share, and each component is placed in a separate hopper. The weight loss metering system can accurately discharge the material according to the preset proportion of the component. The continuous rotation of the single screw can ensure the melting, mixing and plasticization of the material. The pressure sensor system 3 is connected to the mechanical connection channel between the single-screw extruder system 1 and the injection molding machine injection system 2. During the joint working process of the single-screw extruder system 1 and the injection molding machine injection system 2, the processed material is transported to the second single screw. In the compression section area of ​​the screw 25, the plasticization of the first single screw 14 and the second single screw 25 is a whole linkage process. During the plasticization process, when the first single screw 14 of the single screw extrusion system 1 rotates, the second single screw 25 of the injection molding machine injection system 2 also rotates together; when the plasticization is completed, the first single screw 14 of the single screw extrusion system 1 and the second single screw 25 of the injection molding injection system 2 stop rotating at the same time; compared with the twin-screw mixing system, the new design greatly reduces the difficulty of operating the equipment, and simplifies the complexity of the equipment. It does not need to be equipped with professional operators, and only needs to simply set the equipment to automatically complete the corresponding working process.

[0053] During the plasticizing stage, the second single screw 25 rotates to ensure further plasticizing and metering of the processed material. When the second single screw 25 is plasticized and metered, the second single screw 25, the first single screw 14 and the weight loss metering system stop working at the same time, that is, the whole system works intermittently according to the plasticizing cycle.

[0054] During the injection stage, the single screw extrusion system 1 and the weight loss metering system are in standby mode, and the second single screw 25 performs injection. The second single screw 25 can meet the plasticization and metering accuracy and is compatible with conventional injection applications.

[0055] Furthermore, if only material injection molding is performed, the extrusion system can be directly shut down and switched to the production and use of a conventional injection molding machine, thereby increasing the application scope of this direct mixing equipment.

[0056] In other embodiments, 60% PP resin matrix, 5% mineral powder and 35% chopped glass fiber are added to the loss-in-weight metering system, each component is stored independently in a separate hopper, the temperature of the single-screw extrusion system 1 is set to 240°C, and the barrel temperature of the injection molding machine injection system 2 is set to 245°C. The injection molding machine template closes and applies clamping force. When injection starts, the nozzle 22 opens, and the second single screw 25 completes the injection pressure holding action. At this time, the injection speed is 50 mm / s, and the pressure holding pressure is 300 bar. After 3 seconds, the pressure holding ends, the nozzle 22 is closed, and the cooling and plasticizing stage is entered. The second single screw 25 of the injection molding machine injection system 2 rotates simultaneously with the first single screw 14 of the single screw extrusion system 1. At this time, the weight loss metering system unloads the material according to the set component ratio. The melt after mixing is transported to the injection molding machine injection system 2 by the single screw extrusion system 1 through the melt channel of the second feeding port 23. At the same time, the second single screw 25 accurately meters the melt to prepare for the next injection. After the cooling time is over, the injection molding machine lowers the clamping force, the template opens, and the product is ejected.

[0057] In this embodiment, the rotation speed of the second single screw 25 is matched with the rotation speed of the single screw extrusion system 1. The screw speed of the single screw extrusion system 1 is set to 250rpm, the matching value is 38%, the speed of the second single screw 25 is automatically switched to 95rpm, the back pressure is set to 20bar, the storage position is 110mm, the maximum pressure of the pressure sensor 3 is 200bar, the preset alarm pressure value is 120bar, and the preset shutdown pressure value is 150bar.

[0058] An embodiment of one aspect of the present invention, see Figure 4 As shown, a composite propeller component of a low-altitude aircraft is provided, and the propeller component is processed by an injection molding machine.

[0059] The processing steps are: Step 1: Each component is stored in a sufficient amount in the hopper through the first feeding port 12 and fed; wherein the formula component ratio is 55% of PA resin matrix, 5% of mineral powder, and 40% of chopped glass fiber; the temperature of the single screw extruder system 1 is 290°C; the temperature of the barrel of the injection molding machine injection system 2 is set to 295°C; Step 2: The injection molding machine template is closed and clamped, the nozzle 22 is opened, the injection system 2 of the injection molding machine completes the injection action, and the pressure is maintained. After the pressure is maintained, the nozzle 22 is closed; wherein, the first section injection length is 180mm-170mm, and the injection speed is 35mm / s; the second section injection length is 170mm-19mm, and the injection speed is 50mm / s; the third section injection length is 19mm-12mm, and the injection speed is 50mm / s; the pressure holding pressure is 300bar, and the pressure holding time is 3s; Step 3: The injection molding machine injection system 2 and the single screw extrusion system 1 rotate simultaneously, and the weight loss metering system discharges materials according to the preset component ratio. The mixed melt is transported to the injection molding machine injection system 2 through the single screw extrusion system 1, and the pressure sensor 3 measures the pressure during the melt transmission; wherein, the single screw extrusion system 1 rotates at 260rpm, the matching value is 35%, the injection molding machine injection system 2 rotates at 91rpm, the back pressure is 20bar, and the storage position is 180mm; the pressure sensor 3 sets the alarm pressure value to 149bar and the shutdown pressure value to 150bar; Step 4: Cool the melt. After cooling, the injection molding machine lowers the clamping force, opens the mold plate and takes out the product.

[0060] In this embodiment, the rotation speed of the second single screw 25 of the injection molding machine injection system 2 matches the rotation speed of the first single screw 14 of the single screw extrusion system 1, and the percentage can be freely set; in order to protect the safety of the equipment, the maximum pressure that the pressure sensor 3 can withstand is 200 bar.

[0061] When the composite propeller component is processed, the control system selects operation without the single-screw extrusion system 1 (Operation without EXT), and the equipment is switched to the standard injection molding mode.

[0062] In this embodiment, please refer to Figure 1 and Figure 2 As shown, the third feeding port 24 is used for unloading. First, the cleaning material is added for rapid cleaning to discharge the previously processed material. The temperature of the injection system 2 of the injection molding machine is set to 260°C. After the temperature stabilizes, 30% long glass fiber reinforced PP raw material is added for other parts processing.

[0063] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of this application.

Claims

1. A mixing and injection molding device, characterized in that: include: A single-screw extrusion system (1), comprising a single-screw extruder (11), wherein a first feeding port (12) is provided at one end of the single-screw extruder (11), and a first discharge port (13) is provided at the other end of the single-screw extruder (11); and An injection molding machine injection system (2), the injection molding machine injection system (2) comprising a single-screw injection device (21) and a second feeding port (23) provided on the single-screw injection device (21), the first discharge port (13) being connected to the second feeding port (23); The second feed port (23) is located upstream of the single screw injection device (21) in the material flow direction, and the single screw extrusion system (1) and the injection molding machine injection system (2) can operate in conjunction or the injection molding machine injection system (2) can operate alone.

2. The mixing and injection molding device according to claim 1, characterized in that: The injection molding machine injection system (2) is arranged horizontally, and the single-screw extrusion system (1) is installed at a preset angle to the injection molding machine injection system (2).

3. The mixing and injection molding device according to claim 2, characterized in that: The preset angle is 30 degrees to 60 degrees.

4. The mixing and injection molding device according to claim 2, characterized in that: The single-screw extrusion system (1) is located directly above the injection system (2) of the injection molding machine, and the single-screw extrusion device (11) and the single-screw injection device (21) are mechanically connected.

5. The mixing and injection molding device according to claim 1, characterized in that: The single-screw extruder (11) is provided with a first single screw (14); the single-screw injection device (21) is provided with a second single screw (25); the first single screw (14) and the second single screw (25) are connected via telecommunication; when the first single screw (14) rotates, the first single screw (14) and the second single screw (25) can be started and stopped during an injection cycle via software control.

6. The mixing and injection molding device according to claim 5, characterized in that: The first single screw (14) has a screw length-to-diameter ratio of 25-35.

7. The mixing and injection molding device according to claim 1, characterized in that: The injection molding machine injection system (2) further comprises a third feeding port (24), which is located upstream of the second feeding port (23) in the material flow direction and is used to directly feed material to the single-screw injection device (21).

8. The mixing and injection molding device according to claim 1, characterized in that: The injection molding machine injection system (2) further comprises a nozzle (22); The nozzle (22) is of a locked type and is installed at the end position of the material flow direction of the single screw injection device (21).

9. The mixing and injection molding device according to claim 1, characterized in that: It also includes early warning systems; The early warning system comprises a pressure sensor (3) arranged at the connection position between the single-screw extrusion system (1) and the injection molding machine injection system (2), and is used to detect the internal material pressure of the single-screw extrusion device (11) and issue a pressure early warning.

10. An injection molding machine, characterized in that: A mixing and injection molding device comprising the mixing and injection molding device according to any one of claims 1 to 9.

11. The injection molding machine according to claim 10, characterized in that: include: Injection molding machine housing (4); The injection molding machine injection system (2) is fixedly installed inside the injection molding machine housing (4).

12. A mixing and injection molding method, characterized in that: The mixing and injection molding device according to any one of claims 1 to 9 comprises: Mixing stage: the hopper of the weight loss metering system adds the plastic resin material into the single screw extruder (11) through the first feeding port (12) according to a preset ratio and mixes the material to obtain a mixed material; Plasticizing stage: the mixed material is transported from the first discharge port (13) of the single-screw extrusion system (1) to the second single screw (25) of the single-screw injection device (21) through a channel to obtain injection molding material; Wherein, a pressure sensor (3) is provided in the channel; Injection stage: The injection molding material is injected through the nozzle (22) into the working device of the next stage.

13. The mixing and injection molding method according to claim 12, characterized in that: The mixing stage also includes: When the first single screw (14) continues to rotate, the mixed material is transported to the second single screw (25).

14. The mixing and injection molding method according to claim 12, characterized in that: The injection phase also includes: When the second single screw (25) is plasticized to a preset metering amount, the second single screw (25), the first single screw (14) and the weight loss metering system stop working simultaneously.

15. The mixing and injection molding method according to claim 12, characterized in that: During the injection stage, the single-screw extruder (11) can be turned off, and the single-screw injection device (21) can be used directly for injection molding.

16. The mixing and injection molding method according to claim 12, characterized in that: During the plasticizing stage, the pressure sensor (3) bears a maximum pressure of 200 bar.

17. The mixing and injection molding method according to claim 12, characterized in that: During the injection phase, the nozzle (22) is opened and the second single screw (25) completes the pressure maintenance.

18. The mixing and injection molding method according to claim 12, characterized in that: The single screw extruder (11) is used for processing thermoplastic resin materials and corresponding formulations.

19. The mixing and injection molding method according to claim 18, characterized in that: The plastic resin material includes, but is not limited to, polyolefin material, acrylonitrile-butadiene-styrene plastic, engineering plastic alloy, polycarbonate plastic, polyamide plastic, EPDM rubber material or polylactic acid material.

20. The mixing and injection molding method according to claim 19, characterized in that: The plastic resin material may be added with an auxiliary agent.

21. The mixing and injection molding method according to claim 20, characterized in that: The auxiliary agent includes but is not limited to filler mineral powder, heat stabilizer, ultraviolet absorber, impact modifier or conductive filler.

22. The mixing and injection molding method according to claim 12, characterized in that: The single-screw extruder (11) is used to process fibers including but not limited to glass fibers, carbon fibers, aramid fibers or basalt fibers.

23. The mixing and injection molding method according to claim 14, characterized in that: The rotation speed percentage of the second single screw (25) and the first single screw (14) is 20%-73%.

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